Abstract

The spectrum of triply ionized sodium, Na IV, has been studied in the 2500-1300 and 415-135 Å ranges and its analysis extended. About 55 lines in the 2160-1450 Å range have been observed and classified as 3<i>s</i>-3<i>p</i> and 3<i>p</i>-3<i>d</i> combinations, and some 25 lines are either newly observed or newly resolved in the 210-135 Å range. New levels that have been established include 18 levels belonging to the 3<i>p</i> configuration, 16 levels belonging to six new 3d terms, the <sup>5</sup><i>S</i><sub>2</sub> level of 3s, and two (<sup>2</sup><i>P</i>)<sup>3</sup><i>P</i> levels of 4<i>s</i>. For seven previously known 3<i>s</i>, 3<i>d</i>, 4<i>s</i>, and 4<i>d</i> triplet terms the fine structure has been determined: 19 out of 21 possible levels have now been established. No intercombinations between the 3<i>s</i>, 3<i>p</i>, and 3<i>d</i> quintet system and the singlet-triplet system have been observed. Isoelectronic comparisons in the OI, FII, NeIII, NaIV, MgV sequence have been made as have least squares fits of theoretical energy expressions to observed 3<i>s</i>, 3<i>p</i>, and 3<i>d</i> levels of NaIV. The 3<i>s</i>, 3<i>p</i>, and 3<i>d</i> configurations show good <i>LS</i> purity.

© 1976 Optical Society of America

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  1. Ch. E. Moore, Atomic Energy Levels, Vol. I, Natl. Bur. Stand. (U.S.) Circ. No. 467 (U.S.G.P.O., Washington, D. C., 1949).
  2. J. Söderqvist, Nova Acta Reg. Soc. Sci. Uppsala IV 9, No. 7 (1934).
  3. J. Söderqvist, Ark. Mat. Astron. Fys. (Stockholm) 32A, No. 19 (1946).
  4. I. S. Bowen, Astrophys. J. 132, 1 (1960).
  5. M. Gaillard, P. Ceyzeriat, A. Denis, and M. Dufay, C. R. Acad. Sci. B (Paris) 269, 526 (1969).
  6. M. Dufay, M. Gaillard, and M. Carré, Phys. Rev. A 3, 1367 (1971).
  7. T. Goto, M. S. Gautam, and Y. N. Joshi, Physica (Utrecht) 66, 70 (1973).
  8. T. Goto, M. S. Gautam, and Y. N. Joshi, Can. J. Phys. 51, 1244 (1973).
  9. L. Minnhagen and H. Nietsche, Phys. Scr. 5, 237 (1972).
  10. L. Minnhagen, Phys. Scripta 11, 38 (1975).
  11. T. Lundström and L. Minnhagen, Phys. Scr. 5, 243 (1972).
  12. B. Edlén, Encyclopedia of Physics, Vol. 27 (Springer-Verlag, Heidelberg, 1964), p. 172.

Bowen, I. S.

I. S. Bowen, Astrophys. J. 132, 1 (1960).

Carré, M.

M. Dufay, M. Gaillard, and M. Carré, Phys. Rev. A 3, 1367 (1971).

Ceyzeriat, P.

M. Gaillard, P. Ceyzeriat, A. Denis, and M. Dufay, C. R. Acad. Sci. B (Paris) 269, 526 (1969).

Denis, A.

M. Gaillard, P. Ceyzeriat, A. Denis, and M. Dufay, C. R. Acad. Sci. B (Paris) 269, 526 (1969).

Dufay, M.

M. Gaillard, P. Ceyzeriat, A. Denis, and M. Dufay, C. R. Acad. Sci. B (Paris) 269, 526 (1969).

M. Dufay, M. Gaillard, and M. Carré, Phys. Rev. A 3, 1367 (1971).

Edlén, B.

B. Edlén, Encyclopedia of Physics, Vol. 27 (Springer-Verlag, Heidelberg, 1964), p. 172.

Gaillard, M.

M. Dufay, M. Gaillard, and M. Carré, Phys. Rev. A 3, 1367 (1971).

M. Gaillard, P. Ceyzeriat, A. Denis, and M. Dufay, C. R. Acad. Sci. B (Paris) 269, 526 (1969).

Gautam, M. S.

T. Goto, M. S. Gautam, and Y. N. Joshi, Physica (Utrecht) 66, 70 (1973).

T. Goto, M. S. Gautam, and Y. N. Joshi, Can. J. Phys. 51, 1244 (1973).

Goto, T.

T. Goto, M. S. Gautam, and Y. N. Joshi, Physica (Utrecht) 66, 70 (1973).

T. Goto, M. S. Gautam, and Y. N. Joshi, Can. J. Phys. 51, 1244 (1973).

Joshi, Y. N.

T. Goto, M. S. Gautam, and Y. N. Joshi, Physica (Utrecht) 66, 70 (1973).

T. Goto, M. S. Gautam, and Y. N. Joshi, Can. J. Phys. 51, 1244 (1973).

Lundström, T.

T. Lundström and L. Minnhagen, Phys. Scr. 5, 243 (1972).

Minnhagen, L.

T. Lundström and L. Minnhagen, Phys. Scr. 5, 243 (1972).

L. Minnhagen, Phys. Scripta 11, 38 (1975).

L. Minnhagen and H. Nietsche, Phys. Scr. 5, 237 (1972).

Moore, Ch. E.

Ch. E. Moore, Atomic Energy Levels, Vol. I, Natl. Bur. Stand. (U.S.) Circ. No. 467 (U.S.G.P.O., Washington, D. C., 1949).

Nietsche, H.

L. Minnhagen and H. Nietsche, Phys. Scr. 5, 237 (1972).

Söderqvist, J.

J. Söderqvist, Nova Acta Reg. Soc. Sci. Uppsala IV 9, No. 7 (1934).

J. Söderqvist, Ark. Mat. Astron. Fys. (Stockholm) 32A, No. 19 (1946).

Other (12)

Ch. E. Moore, Atomic Energy Levels, Vol. I, Natl. Bur. Stand. (U.S.) Circ. No. 467 (U.S.G.P.O., Washington, D. C., 1949).

J. Söderqvist, Nova Acta Reg. Soc. Sci. Uppsala IV 9, No. 7 (1934).

J. Söderqvist, Ark. Mat. Astron. Fys. (Stockholm) 32A, No. 19 (1946).

I. S. Bowen, Astrophys. J. 132, 1 (1960).

M. Gaillard, P. Ceyzeriat, A. Denis, and M. Dufay, C. R. Acad. Sci. B (Paris) 269, 526 (1969).

M. Dufay, M. Gaillard, and M. Carré, Phys. Rev. A 3, 1367 (1971).

T. Goto, M. S. Gautam, and Y. N. Joshi, Physica (Utrecht) 66, 70 (1973).

T. Goto, M. S. Gautam, and Y. N. Joshi, Can. J. Phys. 51, 1244 (1973).

L. Minnhagen and H. Nietsche, Phys. Scr. 5, 237 (1972).

L. Minnhagen, Phys. Scripta 11, 38 (1975).

T. Lundström and L. Minnhagen, Phys. Scr. 5, 243 (1972).

B. Edlén, Encyclopedia of Physics, Vol. 27 (Springer-Verlag, Heidelberg, 1964), p. 172.

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